get_layer_revisions() uses the os.path module but it is not included
in the imports.
(From OE-Core rev: 4339ef5b46c39cce402d1cc3526b39702837b839)
Signed-off-by: Jermain Horsman <jermain.horsman@nedap.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>